Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 890 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
new file mode 100644
index 000000000..acc561c0f
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -0,0 +1,890 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2008-2012 Intel Corporation
+ */
+
+#include <linux/errno.h>
+#include <linux/mutex.h>
+
+#include <drm/drm_mm.h>
+#include <drm/i915_drm.h>
+
+#include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_region.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_gt_mcr.h"
+#include "gt/intel_gt_regs.h"
+#include "gt/intel_region_lmem.h"
+#include "i915_drv.h"
+#include "i915_gem_stolen.h"
+#include "i915_pci.h"
+#include "i915_reg.h"
+#include "i915_utils.h"
+#include "i915_vgpu.h"
+#include "intel_mchbar_regs.h"
+#include "intel_pci_config.h"
+
+/*
+ * The BIOS typically reserves some of the system's memory for the exclusive
+ * use of the integrated graphics. This memory is no longer available for
+ * use by the OS and so the user finds that his system has less memory
+ * available than he put in. We refer to this memory as stolen.
+ *
+ * The BIOS will allocate its framebuffer from the stolen memory. Our
+ * goal is try to reuse that object for our own fbcon which must always
+ * be available for panics. Anything else we can reuse the stolen memory
+ * for is a boon.
+ */
+
+int i915_gem_stolen_insert_node_in_range(struct drm_i915_private *i915,
+					 struct drm_mm_node *node, u64 size,
+					 unsigned alignment, u64 start, u64 end)
+{
+	int ret;
+
+	if (!drm_mm_initialized(&i915->mm.stolen))
+		return -ENODEV;
+
+	/* WaSkipStolenMemoryFirstPage:bdw+ */
+	if (GRAPHICS_VER(i915) >= 8 && start < 4096)
+		start = 4096;
+
+	mutex_lock(&i915->mm.stolen_lock);
+	ret = drm_mm_insert_node_in_range(&i915->mm.stolen, node,
+					  size, alignment, 0,
+					  start, end, DRM_MM_INSERT_BEST);
+	mutex_unlock(&i915->mm.stolen_lock);
+
+	return ret;
+}
+
+int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
+				struct drm_mm_node *node, u64 size,
+				unsigned alignment)
+{
+	return i915_gem_stolen_insert_node_in_range(i915, node,
+						    size, alignment,
+						    I915_GEM_STOLEN_BIAS,
+						    U64_MAX);
+}
+
+void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
+				 struct drm_mm_node *node)
+{
+	mutex_lock(&i915->mm.stolen_lock);
+	drm_mm_remove_node(node);
+	mutex_unlock(&i915->mm.stolen_lock);
+}
+
+static int i915_adjust_stolen(struct drm_i915_private *i915,
+			      struct resource *dsm)
+{
+	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
+	struct intel_uncore *uncore = ggtt->vm.gt->uncore;
+	struct resource *r;
+
+	if (dsm->start == 0 || dsm->end <= dsm->start)
+		return -EINVAL;
+
+	/*
+	 * TODO: We have yet too encounter the case where the GTT wasn't at the
+	 * end of stolen. With that assumption we could simplify this.
+	 */
+
+	/* Make sure we don't clobber the GTT if it's within stolen memory */
+	if (GRAPHICS_VER(i915) <= 4 &&
+	    !IS_G33(i915) && !IS_PINEVIEW(i915) && !IS_G4X(i915)) {
+		struct resource stolen[2] = {*dsm, *dsm};
+		struct resource ggtt_res;
+		resource_size_t ggtt_start;
+
+		ggtt_start = intel_uncore_read(uncore, PGTBL_CTL);
+		if (GRAPHICS_VER(i915) == 4)
+			ggtt_start = (ggtt_start & PGTBL_ADDRESS_LO_MASK) |
+				     (ggtt_start & PGTBL_ADDRESS_HI_MASK) << 28;
+		else
+			ggtt_start &= PGTBL_ADDRESS_LO_MASK;
+
+		ggtt_res =
+			(struct resource) DEFINE_RES_MEM(ggtt_start,
+							 ggtt_total_entries(ggtt) * 4);
+
+		if (ggtt_res.start >= stolen[0].start && ggtt_res.start < stolen[0].end)
+			stolen[0].end = ggtt_res.start;
+		if (ggtt_res.end > stolen[1].start && ggtt_res.end <= stolen[1].end)
+			stolen[1].start = ggtt_res.end;
+
+		/* Pick the larger of the two chunks */
+		if (resource_size(&stolen[0]) > resource_size(&stolen[1]))
+			*dsm = stolen[0];
+		else
+			*dsm = stolen[1];
+
+		if (stolen[0].start != stolen[1].start ||
+		    stolen[0].end != stolen[1].end) {
+			drm_dbg(&i915->drm,
+				"GTT within stolen memory at %pR\n",
+				&ggtt_res);
+			drm_dbg(&i915->drm, "Stolen memory adjusted to %pR\n",
+				dsm);
+		}
+	}
+
+	/*
+	 * With stolen lmem, we don't need to check if the address range
+	 * overlaps with the non-stolen system memory range, since lmem is local
+	 * to the gpu.
+	 */
+	if (HAS_LMEM(i915))
+		return 0;
+
+	/*
+	 * Verify that nothing else uses this physical address. Stolen
+	 * memory should be reserved by the BIOS and hidden from the
+	 * kernel. So if the region is already marked as busy, something
+	 * is seriously wrong.
+	 */
+	r = devm_request_mem_region(i915->drm.dev, dsm->start,
+				    resource_size(dsm),
+				    "Graphics Stolen Memory");
+	if (r == NULL) {
+		/*
+		 * One more attempt but this time requesting region from
+		 * start + 1, as we have seen that this resolves the region
+		 * conflict with the PCI Bus.
+		 * This is a BIOS w/a: Some BIOS wrap stolen in the root
+		 * PCI bus, but have an off-by-one error. Hence retry the
+		 * reservation starting from 1 instead of 0.
+		 * There's also BIOS with off-by-one on the other end.
+		 */
+		r = devm_request_mem_region(i915->drm.dev, dsm->start + 1,
+					    resource_size(dsm) - 2,
+					    "Graphics Stolen Memory");
+		/*
+		 * GEN3 firmware likes to smash pci bridges into the stolen
+		 * range. Apparently this works.
+		 */
+		if (!r && GRAPHICS_VER(i915) != 3) {
+			drm_err(&i915->drm,
+				"conflict detected with stolen region: %pR\n",
+				dsm);
+
+			return -EBUSY;
+		}
+	}
+
+	return 0;
+}
+
+static void i915_gem_cleanup_stolen(struct drm_i915_private *i915)
+{
+	if (!drm_mm_initialized(&i915->mm.stolen))
+		return;
+
+	drm_mm_takedown(&i915->mm.stolen);
+}
+
+static void g4x_get_stolen_reserved(struct drm_i915_private *i915,
+				    struct intel_uncore *uncore,
+				    resource_size_t *base,
+				    resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore,
+					IS_GM45(i915) ?
+					CTG_STOLEN_RESERVED :
+					ELK_STOLEN_RESERVED);
+	resource_size_t stolen_top = i915->dsm.end + 1;
+
+	drm_dbg(&i915->drm, "%s_STOLEN_RESERVED = %08x\n",
+		IS_GM45(i915) ? "CTG" : "ELK", reg_val);
+
+	if ((reg_val & G4X_STOLEN_RESERVED_ENABLE) == 0)
+		return;
+
+	/*
+	 * Whether ILK really reuses the ELK register for this is unclear.
+	 * Let's see if we catch anyone with this supposedly enabled on ILK.
+	 */
+	drm_WARN(&i915->drm, GRAPHICS_VER(i915) == 5,
+		 "ILK stolen reserved found? 0x%08x\n",
+		 reg_val);
+
+	if (!(reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK))
+		return;
+
+	*base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
+	drm_WARN_ON(&i915->drm,
+		    (reg_val & G4X_STOLEN_RESERVED_ADDR1_MASK) < *base);
+
+	*size = stolen_top - *base;
+}
+
+static void gen6_get_stolen_reserved(struct drm_i915_private *i915,
+				     struct intel_uncore *uncore,
+				     resource_size_t *base,
+				     resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+		return;
+
+	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
+
+	switch (reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK) {
+	case GEN6_STOLEN_RESERVED_1M:
+		*size = 1024 * 1024;
+		break;
+	case GEN6_STOLEN_RESERVED_512K:
+		*size = 512 * 1024;
+		break;
+	case GEN6_STOLEN_RESERVED_256K:
+		*size = 256 * 1024;
+		break;
+	case GEN6_STOLEN_RESERVED_128K:
+		*size = 128 * 1024;
+		break;
+	default:
+		*size = 1024 * 1024;
+		MISSING_CASE(reg_val & GEN6_STOLEN_RESERVED_SIZE_MASK);
+	}
+}
+
+static void vlv_get_stolen_reserved(struct drm_i915_private *i915,
+				    struct intel_uncore *uncore,
+				    resource_size_t *base,
+				    resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
+	resource_size_t stolen_top = i915->dsm.end + 1;
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+		return;
+
+	switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
+	default:
+		MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
+		fallthrough;
+	case GEN7_STOLEN_RESERVED_1M:
+		*size = 1024 * 1024;
+		break;
+	}
+
+	/*
+	 * On vlv, the ADDR_MASK portion is left as 0 and HW deduces the
+	 * reserved location as (top - size).
+	 */
+	*base = stolen_top - *size;
+}
+
+static void gen7_get_stolen_reserved(struct drm_i915_private *i915,
+				     struct intel_uncore *uncore,
+				     resource_size_t *base,
+				     resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+		return;
+
+	*base = reg_val & GEN7_STOLEN_RESERVED_ADDR_MASK;
+
+	switch (reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK) {
+	case GEN7_STOLEN_RESERVED_1M:
+		*size = 1024 * 1024;
+		break;
+	case GEN7_STOLEN_RESERVED_256K:
+		*size = 256 * 1024;
+		break;
+	default:
+		*size = 1024 * 1024;
+		MISSING_CASE(reg_val & GEN7_STOLEN_RESERVED_SIZE_MASK);
+	}
+}
+
+static void chv_get_stolen_reserved(struct drm_i915_private *i915,
+				    struct intel_uncore *uncore,
+				    resource_size_t *base,
+				    resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+		return;
+
+	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
+
+	switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
+	case GEN8_STOLEN_RESERVED_1M:
+		*size = 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_2M:
+		*size = 2 * 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_4M:
+		*size = 4 * 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_8M:
+		*size = 8 * 1024 * 1024;
+		break;
+	default:
+		*size = 8 * 1024 * 1024;
+		MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
+	}
+}
+
+static void bdw_get_stolen_reserved(struct drm_i915_private *i915,
+				    struct intel_uncore *uncore,
+				    resource_size_t *base,
+				    resource_size_t *size)
+{
+	u32 reg_val = intel_uncore_read(uncore, GEN6_STOLEN_RESERVED);
+	resource_size_t stolen_top = i915->dsm.end + 1;
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = %08x\n", reg_val);
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ENABLE))
+		return;
+
+	if (!(reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK))
+		return;
+
+	*base = reg_val & GEN6_STOLEN_RESERVED_ADDR_MASK;
+	*size = stolen_top - *base;
+}
+
+static void icl_get_stolen_reserved(struct drm_i915_private *i915,
+				    struct intel_uncore *uncore,
+				    resource_size_t *base,
+				    resource_size_t *size)
+{
+	u64 reg_val = intel_uncore_read64(uncore, GEN6_STOLEN_RESERVED);
+
+	drm_dbg(&i915->drm, "GEN6_STOLEN_RESERVED = 0x%016llx\n", reg_val);
+
+	*base = reg_val & GEN11_STOLEN_RESERVED_ADDR_MASK;
+
+	switch (reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK) {
+	case GEN8_STOLEN_RESERVED_1M:
+		*size = 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_2M:
+		*size = 2 * 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_4M:
+		*size = 4 * 1024 * 1024;
+		break;
+	case GEN8_STOLEN_RESERVED_8M:
+		*size = 8 * 1024 * 1024;
+		break;
+	default:
+		*size = 8 * 1024 * 1024;
+		MISSING_CASE(reg_val & GEN8_STOLEN_RESERVED_SIZE_MASK);
+	}
+}
+
+static int i915_gem_init_stolen(struct intel_memory_region *mem)
+{
+	struct drm_i915_private *i915 = mem->i915;
+	struct intel_uncore *uncore = &i915->uncore;
+	resource_size_t reserved_base, stolen_top;
+	resource_size_t reserved_total, reserved_size;
+
+	mutex_init(&i915->mm.stolen_lock);
+
+	if (intel_vgpu_active(i915)) {
+		drm_notice(&i915->drm,
+			   "%s, disabling use of stolen memory\n",
+			   "iGVT-g active");
+		return 0;
+	}
+
+	if (i915_vtd_active(i915) && GRAPHICS_VER(i915) < 8) {
+		drm_notice(&i915->drm,
+			   "%s, disabling use of stolen memory\n",
+			   "DMAR active");
+		return 0;
+	}
+
+	if (resource_size(&mem->region) == 0)
+		return 0;
+
+	i915->dsm = mem->region;
+
+	if (i915_adjust_stolen(i915, &i915->dsm))
+		return 0;
+
+	GEM_BUG_ON(i915->dsm.start == 0);
+	GEM_BUG_ON(i915->dsm.end <= i915->dsm.start);
+
+	stolen_top = i915->dsm.end + 1;
+	reserved_base = stolen_top;
+	reserved_size = 0;
+
+	if (GRAPHICS_VER(i915) >= 11) {
+		icl_get_stolen_reserved(i915, uncore,
+					&reserved_base, &reserved_size);
+	} else if (GRAPHICS_VER(i915) >= 8) {
+		if (IS_LP(i915))
+			chv_get_stolen_reserved(i915, uncore,
+						&reserved_base, &reserved_size);
+		else
+			bdw_get_stolen_reserved(i915, uncore,
+						&reserved_base, &reserved_size);
+	} else if (GRAPHICS_VER(i915) >= 7) {
+		if (IS_VALLEYVIEW(i915))
+			vlv_get_stolen_reserved(i915, uncore,
+						&reserved_base, &reserved_size);
+		else
+			gen7_get_stolen_reserved(i915, uncore,
+						 &reserved_base, &reserved_size);
+	} else if (GRAPHICS_VER(i915) >= 6) {
+		gen6_get_stolen_reserved(i915, uncore,
+					 &reserved_base, &reserved_size);
+	} else if (GRAPHICS_VER(i915) >= 5 || IS_G4X(i915)) {
+		g4x_get_stolen_reserved(i915, uncore,
+					&reserved_base, &reserved_size);
+	}
+
+	/*
+	 * Our expectation is that the reserved space is at the top of the
+	 * stolen region and *never* at the bottom. If we see !reserved_base,
+	 * it likely means we failed to read the registers correctly.
+	 */
+	if (!reserved_base) {
+		drm_err(&i915->drm,
+			"inconsistent reservation %pa + %pa; ignoring\n",
+			&reserved_base, &reserved_size);
+		reserved_base = stolen_top;
+		reserved_size = 0;
+	}
+
+	i915->dsm_reserved =
+		(struct resource)DEFINE_RES_MEM(reserved_base, reserved_size);
+
+	if (!resource_contains(&i915->dsm, &i915->dsm_reserved)) {
+		drm_err(&i915->drm,
+			"Stolen reserved area %pR outside stolen memory %pR\n",
+			&i915->dsm_reserved, &i915->dsm);
+		return 0;
+	}
+
+	/* Exclude the reserved region from driver use */
+	mem->region.end = reserved_base - 1;
+	mem->io_size = min(mem->io_size, resource_size(&mem->region));
+
+	/* It is possible for the reserved area to end before the end of stolen
+	 * memory, so just consider the start. */
+	reserved_total = stolen_top - reserved_base;
+
+	i915->stolen_usable_size =
+		resource_size(&i915->dsm) - reserved_total;
+
+	drm_dbg(&i915->drm,
+		"Memory reserved for graphics device: %lluK, usable: %lluK\n",
+		(u64)resource_size(&i915->dsm) >> 10,
+		(u64)i915->stolen_usable_size >> 10);
+
+	if (i915->stolen_usable_size == 0)
+		return 0;
+
+	/* Basic memrange allocator for stolen space. */
+	drm_mm_init(&i915->mm.stolen, 0, i915->stolen_usable_size);
+
+	return 0;
+}
+
+static void dbg_poison(struct i915_ggtt *ggtt,
+		       dma_addr_t addr, resource_size_t size,
+		       u8 x)
+{
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+	if (!drm_mm_node_allocated(&ggtt->error_capture))
+		return;
+
+	if (ggtt->vm.bind_async_flags & I915_VMA_GLOBAL_BIND)
+		return; /* beware stop_machine() inversion */
+
+	GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
+
+	mutex_lock(&ggtt->error_mutex);
+	while (size) {
+		void __iomem *s;
+
+		ggtt->vm.insert_page(&ggtt->vm, addr,
+				     ggtt->error_capture.start,
+				     I915_CACHE_NONE, 0);
+		mb();
+
+		s = io_mapping_map_wc(&ggtt->iomap,
+				      ggtt->error_capture.start,
+				      PAGE_SIZE);
+		memset_io(s, x, PAGE_SIZE);
+		io_mapping_unmap(s);
+
+		addr += PAGE_SIZE;
+		size -= PAGE_SIZE;
+	}
+	mb();
+	ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
+	mutex_unlock(&ggtt->error_mutex);
+#endif
+}
+
+static struct sg_table *
+i915_pages_create_for_stolen(struct drm_device *dev,
+			     resource_size_t offset, resource_size_t size)
+{
+	struct drm_i915_private *i915 = to_i915(dev);
+	struct sg_table *st;
+	struct scatterlist *sg;
+
+	GEM_BUG_ON(range_overflows(offset, size, resource_size(&i915->dsm)));
+
+	/* We hide that we have no struct page backing our stolen object
+	 * by wrapping the contiguous physical allocation with a fake
+	 * dma mapping in a single scatterlist.
+	 */
+
+	st = kmalloc(sizeof(*st), GFP_KERNEL);
+	if (st == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	if (sg_alloc_table(st, 1, GFP_KERNEL)) {
+		kfree(st);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	sg = st->sgl;
+	sg->offset = 0;
+	sg->length = size;
+
+	sg_dma_address(sg) = (dma_addr_t)i915->dsm.start + offset;
+	sg_dma_len(sg) = size;
+
+	return st;
+}
+
+static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct sg_table *pages =
+		i915_pages_create_for_stolen(obj->base.dev,
+					     obj->stolen->start,
+					     obj->stolen->size);
+	if (IS_ERR(pages))
+		return PTR_ERR(pages);
+
+	dbg_poison(to_gt(i915)->ggtt,
+		   sg_dma_address(pages->sgl),
+		   sg_dma_len(pages->sgl),
+		   POISON_INUSE);
+
+	__i915_gem_object_set_pages(obj, pages, obj->stolen->size);
+
+	return 0;
+}
+
+static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
+					     struct sg_table *pages)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	/* Should only be called from i915_gem_object_release_stolen() */
+
+	dbg_poison(to_gt(i915)->ggtt,
+		   sg_dma_address(pages->sgl),
+		   sg_dma_len(pages->sgl),
+		   POISON_FREE);
+
+	sg_free_table(pages);
+	kfree(pages);
+}
+
+static void
+i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
+
+	GEM_BUG_ON(!stolen);
+	i915_gem_stolen_remove_node(i915, stolen);
+	kfree(stolen);
+
+	i915_gem_object_release_memory_region(obj);
+}
+
+static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
+	.name = "i915_gem_object_stolen",
+	.get_pages = i915_gem_object_get_pages_stolen,
+	.put_pages = i915_gem_object_put_pages_stolen,
+	.release = i915_gem_object_release_stolen,
+};
+
+static int __i915_gem_object_create_stolen(struct intel_memory_region *mem,
+					   struct drm_i915_gem_object *obj,
+					   struct drm_mm_node *stolen)
+{
+	static struct lock_class_key lock_class;
+	unsigned int cache_level;
+	unsigned int flags;
+	int err;
+
+	/*
+	 * Stolen objects are always physically contiguous since we just
+	 * allocate one big block underneath using the drm_mm range allocator.
+	 */
+	flags = I915_BO_ALLOC_CONTIGUOUS;
+
+	drm_gem_private_object_init(&mem->i915->drm, &obj->base, stolen->size);
+	i915_gem_object_init(obj, &i915_gem_object_stolen_ops, &lock_class, flags);
+
+	obj->stolen = stolen;
+	obj->read_domains = I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT;
+	cache_level = HAS_LLC(mem->i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
+	i915_gem_object_set_cache_coherency(obj, cache_level);
+
+	if (WARN_ON(!i915_gem_object_trylock(obj, NULL)))
+		return -EBUSY;
+
+	i915_gem_object_init_memory_region(obj, mem);
+
+	err = i915_gem_object_pin_pages(obj);
+	if (err)
+		i915_gem_object_release_memory_region(obj);
+	i915_gem_object_unlock(obj);
+
+	return err;
+}
+
+static int _i915_gem_object_stolen_init(struct intel_memory_region *mem,
+					struct drm_i915_gem_object *obj,
+					resource_size_t offset,
+					resource_size_t size,
+					resource_size_t page_size,
+					unsigned int flags)
+{
+	struct drm_i915_private *i915 = mem->i915;
+	struct drm_mm_node *stolen;
+	int ret;
+
+	if (!drm_mm_initialized(&i915->mm.stolen))
+		return -ENODEV;
+
+	if (size == 0)
+		return -EINVAL;
+
+	/*
+	 * With discrete devices, where we lack a mappable aperture there is no
+	 * possible way to ever access this memory on the CPU side.
+	 */
+	if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size &&
+	    !(flags & I915_BO_ALLOC_GPU_ONLY))
+		return -ENOSPC;
+
+	stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
+	if (!stolen)
+		return -ENOMEM;
+
+	if (offset != I915_BO_INVALID_OFFSET) {
+		drm_dbg(&i915->drm,
+			"creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
+			&offset, &size);
+
+		stolen->start = offset;
+		stolen->size = size;
+		mutex_lock(&i915->mm.stolen_lock);
+		ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
+		mutex_unlock(&i915->mm.stolen_lock);
+	} else {
+		ret = i915_gem_stolen_insert_node(i915, stolen, size,
+						  mem->min_page_size);
+	}
+	if (ret)
+		goto err_free;
+
+	ret = __i915_gem_object_create_stolen(mem, obj, stolen);
+	if (ret)
+		goto err_remove;
+
+	return 0;
+
+err_remove:
+	i915_gem_stolen_remove_node(i915, stolen);
+err_free:
+	kfree(stolen);
+	return ret;
+}
+
+struct drm_i915_gem_object *
+i915_gem_object_create_stolen(struct drm_i915_private *i915,
+			      resource_size_t size)
+{
+	return i915_gem_object_create_region(i915->mm.stolen_region, size, 0, 0);
+}
+
+static int init_stolen_smem(struct intel_memory_region *mem)
+{
+	/*
+	 * Initialise stolen early so that we may reserve preallocated
+	 * objects for the BIOS to KMS transition.
+	 */
+	return i915_gem_init_stolen(mem);
+}
+
+static int release_stolen_smem(struct intel_memory_region *mem)
+{
+	i915_gem_cleanup_stolen(mem->i915);
+	return 0;
+}
+
+static const struct intel_memory_region_ops i915_region_stolen_smem_ops = {
+	.init = init_stolen_smem,
+	.release = release_stolen_smem,
+	.init_object = _i915_gem_object_stolen_init,
+};
+
+static int init_stolen_lmem(struct intel_memory_region *mem)
+{
+	int err;
+
+	if (GEM_WARN_ON(resource_size(&mem->region) == 0))
+		return -ENODEV;
+
+	/*
+	 * TODO: For stolen lmem we mostly just care about populating the dsm
+	 * related bits and setting up the drm_mm allocator for the range.
+	 * Perhaps split up i915_gem_init_stolen() for this.
+	 */
+	err = i915_gem_init_stolen(mem);
+	if (err)
+		return err;
+
+	if (mem->io_size && !io_mapping_init_wc(&mem->iomap,
+						mem->io_start,
+						mem->io_size)) {
+		err = -EIO;
+		goto err_cleanup;
+	}
+
+	return 0;
+
+err_cleanup:
+	i915_gem_cleanup_stolen(mem->i915);
+	return err;
+}
+
+static int release_stolen_lmem(struct intel_memory_region *mem)
+{
+	if (mem->io_size)
+		io_mapping_fini(&mem->iomap);
+	i915_gem_cleanup_stolen(mem->i915);
+	return 0;
+}
+
+static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = {
+	.init = init_stolen_lmem,
+	.release = release_stolen_lmem,
+	.init_object = _i915_gem_object_stolen_init,
+};
+
+struct intel_memory_region *
+i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
+			   u16 instance)
+{
+	struct intel_uncore *uncore = &i915->uncore;
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+	resource_size_t dsm_size, dsm_base, lmem_size;
+	struct intel_memory_region *mem;
+	resource_size_t io_start, io_size;
+	resource_size_t min_page_size;
+
+	if (WARN_ON_ONCE(instance))
+		return ERR_PTR(-ENODEV);
+
+	if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR))
+		return ERR_PTR(-ENXIO);
+
+	/* Use DSM base address instead for stolen memory */
+	dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+	if (IS_DG1(uncore->i915)) {
+		lmem_size = pci_resource_len(pdev, GEN12_LMEM_BAR);
+		if (WARN_ON(lmem_size < dsm_base))
+			return ERR_PTR(-ENODEV);
+	} else {
+		resource_size_t lmem_range;
+
+		lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF;
+		lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT;
+		lmem_size *= SZ_1G;
+	}
+
+	dsm_size = lmem_size - dsm_base;
+	if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) {
+		io_start = 0;
+		io_size = 0;
+	} else {
+		io_start = pci_resource_start(pdev, GEN12_LMEM_BAR) + dsm_base;
+		io_size = dsm_size;
+	}
+
+	min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
+						I915_GTT_PAGE_SIZE_4K;
+
+	mem = intel_memory_region_create(i915, dsm_base, dsm_size,
+					 min_page_size,
+					 io_start, io_size,
+					 type, instance,
+					 &i915_region_stolen_lmem_ops);
+	if (IS_ERR(mem))
+		return mem;
+
+	/*
+	 * TODO: consider creating common helper to just print all the
+	 * interesting stuff from intel_memory_region, which we can use for all
+	 * our probed regions.
+	 */
+
+	drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n",
+		&mem->io_start);
+	drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &dsm_base);
+
+	intel_memory_region_set_name(mem, "stolen-local");
+
+	mem->private = true;
+
+	return mem;
+}
+
+struct intel_memory_region*
+i915_gem_stolen_smem_setup(struct drm_i915_private *i915, u16 type,
+			   u16 instance)
+{
+	struct intel_memory_region *mem;
+
+	mem = intel_memory_region_create(i915,
+					 intel_graphics_stolen_res.start,
+					 resource_size(&intel_graphics_stolen_res),
+					 PAGE_SIZE, 0, 0, type, instance,
+					 &i915_region_stolen_smem_ops);
+	if (IS_ERR(mem))
+		return mem;
+
+	intel_memory_region_set_name(mem, "stolen-system");
+
+	mem->private = true;
+	return mem;
+}
+
+bool i915_gem_object_is_stolen(const struct drm_i915_gem_object *obj)
+{
+	return obj->ops == &i915_gem_object_stolen_ops;
+}